-84.87% is the change from 866 to 131
Calculation steps:
[( 131 - 866 ) ÷ 866] x 100 = -84.87%
Formula
Percentage change = [(131 - 866) / 866] x 100
Subtract the new number by the original number
131 - 866 = -735
-735 ÷ 866 = -0.848729792147806
-0.848729792147806 x 100 = -84.87%